Screenshot:
We are really cycling through the mount commands... I wonder if the drive was just not mounted in the first place... 
mount -o rw /dev/sda3 /mnt
sudo chown raaghu:raaghu '/media/raaghu/dev/sda3'
I am really sorry for that 
Initially it was mounted. When I changed the permission everything started messing up.
I am totally a newbie to Linux. So, please bear with me
I am also sorry; I am in the habit of using sudo -i so when I type a command for others, I sometimes forget to include sudo (bad habit):
sudo mount -o rw /dev/sda3 /mnt
I may give a lightning fast response, but I am a little slow 
Hey not a prob 
It is great that you are helping me out 
Don't worry I am the slowest 
By the way, it looks like this step worked! Please check.
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Looks good- can you test if you have full access on that drive?
If not, run the sudo chown raaghu:raaghu '/media/raaghu/dev/sda3' again...
No access yet i guess.
Let's see lsblk again and see what that says...
Sure.
Well, it is referring to it as /mnt/a9d058e3-c98d-49ba-80b5-51a2fb3537b8, so let's try doing what it wants us to do...
sudo chown raaghu:raaghu '/mnt/a9d058e3-c98d-49ba-80b5-51a2fb3537b8/raaghu/dev/sda3'
I didn't work I guess.
Am I too sleep dep for the helpdesk right now....
sudo chown raaghu:raaghu '/mnt/a9d058e3-c98d-49ba-80b5-51a2fb3537b8/dev/sda3'
Please don't mind!
Maybe I am too hung up on thinking of the /dev/sda3...
sudo chown raaghu:raaghu '/mnt/a9d058e3-c98d-49ba-80b5-51a2fb3537b'
This should be easy - I have solved this in one post a dozen times. I am stumped.
Oh!! I normally I encounter special problems!
Is there a way out?
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I am sure there is and that it will be easy.
I seem to be failing you right now.
What is the output of
sudo nano /etc/fstab
Well, I see where I went wrong in the /mnt/a9d.... that would try to mount the mount point, not the drive. That makes sense.
However, that /dev/sda3 is not responding is what has me stumped.
Are you able to see the files in your File Manager and access them? But just cannot write within?